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I am trying to list grid cell numbers whose flows contribute to the red cell I draw in the figure according to the known flow directions. Directions and colors are shown in the figure.

What tool can I use to list these grid cell numbers?

Flow Directions and gridcell numbers

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I solved my problem by using the watershed tool in ArcMap. After creating watershed with my flow direction file according to my pour point, I used the intersection tool to obtain point numbers that are inside the watershed area. Watershed area maybe has to be exported as a raster to use intersection tool.

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